I’ve successfully flown a friend’s batch 1 (I think) X4 and have been making some of the cool modifications to it (would link to paul-b-braedin-b-gliderpilot-glydrfreak-flights-build-modifications post, but I’m only allowed 2 links). Just recently, I noticed that there seems to be some debris in the lower pilot-left motor – see pictures and videos here. On the 0:35 video, turn sound way up and listen for the “clink” sounds. Later in that video, you can see/hear the rotor bind and then suddenly release. The most recent thing I did with the X4 prior to noticing this issue was run the motors very lightly and briefly in the other 0:14 video – I then walked it inside to the place where it’s been since.
Any suggestions on how to troubleshoot this? I’m concerned about damaging the motor even though it seemed to spin under power without a noticeable issue the last time I tried that (0:14 video).
I blew some compressed air into most of the holes and that didn’t seem to have an effect. It seems like I should take off the rotor to see if a small rock falls out, but I’m not sure how to do that and whether that’s ok. Does anyone know if that’s ok, or whether I might hurt the motor simply trying to disassemble it? If disassembly is ok, do I just remove those three black allen-head machine screws on the back center of the motor (they seem really tight!). Or, does anyone think the problem might be something other than debris (bad bearing, dislodged magnet, etc)? This X4 has very low motor-spinning time – certainly well under an hour.